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Micro Piles |
Pressure Grouting |
Rock Anchors |
Permeation Grouting
Soil Nailing |
Compaction Grouting |
Micropiles |
Injection Grouting |
Chemical Grouting
Our
techniques apply when adding new structures:
especially
rock anchor,
microfine cement,
soil nailing,
micropile
installations for
foundation support.
We
specialize in
slope stabilization,
anchors,
permeation grouting,
foundation repair
and support,
grouting,
soil nails,
rock drilling,
micropile installations, and
sinkholes. We
use a
problem-solving approach geotechnical
architecture of buildings, bridges,
water plants, sewage plants, tunnels,
sinkholes,
caisson,
shoring,
underpinning,
agriculture, and
roads
construction. We
are experienced in these applications:
micro piles,
sinkhole repair,
permeation grouting, pressure
grout,
soil nails,
chemical grouting,
micropiles,
compaction grout, and
rock anchors.
Our specialties are
rock anchor,
acrylamide and
compaction grouting,
mini piles,
sinkhole repair,
micropiles,
acrylamide grouting, and
soil nailing.
We will continue to dedicate ourselves to
excellence,
including
insurance mortgage, in our performance, in our
integrity, and in our relationships with our
customers. We will carefully weigh our
decisions, actions, and results to make sure
that we remain the most trusted name in the
geotechnical contracting industry. Please
visit our website
http://www.rembco.com/.
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JULY
1997
Footing Foundations
4-8
CALTRANS FOUNDATION MANUAL
where: q
ult
= ultimate bearing capacity
.
= soil unit weight
.
= foundation width
D
f
= depth to the bottom of the footing below final grade
c = soil cohesion, which for the undrained condition equals:
cs q
u
==
1
2
where: s = soil shear strength
q
u
= the unconfined compressive strength
In the above equation, N
.
, N
c
, and N
q
are dimensionless bearing capacity factors that are
functions of the angle of internal friction. The term containing factor N
.
shows the influ-
ence of soil weight and foundation width, that of N
c
shows the influence of the soil cohe-
sion, and that of N
q
shows the influence of the surcharge.
Factors Affecting Bearing Capacity
When the supporting soil is a cohesionless material, the most important soil characteristic
in determining the bearing capacity is the relative density of the material. An increase in
the relative density is accompanied by an increase in the bearing capacity. Relative density
is a function of both ø and
.
, the angle of internal friction and unit weight, respectively.
For cohesive soils, the unconfined compressive strength q
u
, which is a function of clay
consistency, is the soil characteristic affecting bearing capacity. The bearing capacity
increases with an increase in q
u
values.
The location of the water table surface is another factor having a significant impact on the
bearing capacity of both sand and clay.
When the depth of the water table from the bottom of the footing is greater than or equal to
the width of the footing B, the full soil unit weight is used in the general bearing capacity
formula. At these depths, the bearing capacity is only marginally affected by the presence of